pmaports.cfg: use linux-pam-pmos explictly (MR 6025) (MR 5563)

This still worked previously as linux-pam-pmos provides
linux-pam and pmbootstrap resolves that.

[ci:skip-build]
[ci:skip-vercheck]

pmaports.cfg

@@ -18,8 +18,8 @@ pmaports_dir=systemd
 bootstrap_1=abuild alpine-base
 bootstrap_2=systemd
 # Build systemd related pkgs without deps on each other
-bootstrap_3=dbus linux-pam
+bootstrap_3=dbus linux-pam-pmos
 # Build systemd related pkgs *with* deps on each other
-bootstrap_4=systemd dbus linux-pam
+bootstrap_4=systemd dbus linux-pam-pmos
 # Marker that bootstrap is done, only needs to be built once
 bootstrap_5=postmarketos-base-systemd